import {Fn} from "../../types";
import {computed, ref} from 'vue'
import {noop} from "../utils/helper";


// 倒计时
export function useCountDown(timer: number, callback ?: Fn<number>, {
    step = 1000,
    done = noop,
    immediate = false
} = {}) {
    const current = ref(timer)
    let i: any = null

    function callDone() {
        if (i !== null) {
            clearTimeout(i)
        }
        done && done.call(null)
    }

    function run() {
        return setTimeout(() => {
            current.value -= step;
            if (current.value <= 0) {
                callDone()
            } else {
                callback && callback(current.value, step)
                i = run()
            }
        }, step)
    }


    const context = {
        run: () => {
            i = run()
        },
        toSecond: computed(() => (current.value / 1000))
    }

    if (immediate) {
        context.run()
    }

    return [current, context] as [typeof current, typeof context]
}